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Intangible assets | 12 Months Ended
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Dec. 31, 2019
Intangible assets |
Intangible assets | 11. Intangible assets In February 2016, the Company purchased a 51% ownership interest in Aerex Industries, Inc. The purchase transaction identified certain intangible assets with a fair value of $5,900,000 and useful lives as follows: Non-Compete (5 years), Trade name (15 years), Certifications/programs (3 years), Customer backlog (1 year), and Customer relationships (4 years). In October 2019, the Company purchased a 51% ownership interest in PERC Water Corporation. The purchase transaction identified certain intangible assets with a fair value of $3,990,000 and useful lives as follows: Non-Compete (3 years), Trade name (15 years), Customer backlog (2 years), and Facility management contracts (6 years). The costs and accumulated amortization for these assets were as follows:
|  | December 31,
|  | 2019 |  | 2018
Cost |  |  |  |  |  |
Non-compete agreements |  | $ | 530,000 |  | $ | 400,000
Trade names |  |  | 2,700,000 |  |  | 1,400,000
Certifications/programs |  |  | 2,000,000 |  |  | 2,000,000
Customer backlogs |  |  | 460,000 |  |  | 100,000
Customer relationships |  |  | 2,000,000 |  |  | 2,000,000
Facility management contracts |  |  | 2,200,000 |  |  | —
|  |  | 9,890,000 |  |  | 5,900,000
Accumulated amortization |  |  |  |  |  |
Non-compete agreements |  |  | (320,556) |  |  | (233,333)
Trade names |  |  | (380,000) |  |  | (272,222)
Certifications/programs |  |  | (2,000,000) |  |  | (1,944,444)
Customer backlogs |  |  | (130,000) |  |  | (100,000)
Customer relationships |  |  | (1,958,333) |  |  | (1,458,334)
Facility management contracts |  |  | (61,111) |  |  | —
|  |  | (4,850,000) |  |  | (4,008,333)
Intangible assets, net |  | $ | 5,040,000 |  | $ | 1,891,667
Amortization of intangible assets for each of the next five years and thereafter is expected to be as follows:
2020 |  | $ | 891,667
2021 |  |  | 746,667
2022 |  |  | 582,778
2023 |  |  | 546,667
2024 |  |  | 546,667
Thereafter |  |  | 1,725,554
|  | $ | 5,040,000
Amortization expense was $841,667 and $1,340,000 for the years ended December 31, 2019 and 2018, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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